Switching device.



J. H. LEHMAN. SWITCHING DEVICE.

APPLICATION FILED MAR. 10, 1906.

1,036,864, Patented Aug. 27, 1912.

Qwilmcogco M w wuemfof $8M CH'i ocnu JOSEPH H. LEHMAN, OF NEW YORK, N.Y.

SWITCHING DEVICE.

Specification of Letters Patent.

Patented Aug. 27, 1912.

Application filed March 10, 1906. Serial No. 305,219.

York city, in the county of ew York and State of New York, have inventedcertain new and useful Improvements in Switching Devices, of which thefollowing is a specification, reference being had therein to theaccompanying drawing.

.My invention relates to improvements in electrical switching devices,and more specifically, has reference particularly to an apparatusadapted to be used in connection with an explosion engine for thepurpose of timing the spark in the explosion chamber thereof.

Referring to the accompanying drawings, Figure 1 is a plan view of myswitching device. Fig. 2 a section on the line 22 through the center ofFig. 1. Fig. 3 is a view of the brush device in perspective, and Fig. 4is a sectional view of the tongue and its accompanying parts formingpart of the brush device.

5 isvthe bearing of the switching device, and 6 the gasket of the engineadapted to receive and hold the same.

7 is the shaft of the switching device provided with a washer 7, andwith the brush device retained thereupon by the washer 8, keyed thereto,and by the nut 9. This brush device comprises an outer casing 10provided with an interior tubular passage 11 through.

which the end of the shaft 7 protrudes.

12 is a tongue projected from the mouth of the casing 10 by the spring13, and provided with porous material, preferably in the form of a wick,such as felt 14. This porous material is preferably riveted to thetongue 12 of the brush member, and is saturated with suitablelubricating material, such as heavy grease, so that as the tongue 12rotates past the contact pieces 16 it is followed by this wick-likemember of felt 14. through which the grease is forced by the centrifugalforce of the rotation, thereby snufiing out the sparks or flashescreated in the breaking of the circuit.

15 is a circular insulating member provided with contact pieces 16, saidcontact pieces terminating in binding posts on the periphery of saidcircular insulating member, said binding posts comprising screws 17fianged at their outer ends, and each screw provided with a hole 18through which the wire of an electric circuit may be passed. The spiralspring 19 is adapted to force the cap 20 away from the base nut 21,thereby binding the wire 22 of the circuit firmly in place. Y

23 is the cover of the switching device provided on its inner face witha contact member such as a spring 24 adapted to electrically connectsaid cover with the end of the shaft 7, and 25 and 26 are binding screwsadapted to bind said cover in place, also serving as a ground connectionin the electric circuit of the switch.

29 is a disk of insulating material adapted to be inserted between thecircular insulating member 15 and the bearing 5. There is preferably asmall space 27 provided between the circular insulating material and theinsulating disk 29, said space communicating with the pamage 28 so thatany sediment may be readily removed from the bottom of the cup-likechamber formed in the construction of the switching device.

. In operation, the parts are assembled as shown, and the brush deviceis adjusted upon the shaft 7 to the required angle or position to getthe-spark at the right moment in the explosion chamber. It will readilybe observed that this adjustment is obtained simply by loosening up thenut 9 on the end of the shaft 7, shifting the brush device to the properangle and then tightening said nut. The fact that the end of the shaftis cut away on one side and a washer cut to key therewith prevents aslipping of the adjustment ofthe brush in tightening the nut 9 after thebrush has once been set.

Various modifications may be made without departing from the spirit .ofmy inventlon.

'What I claim as new and desire to secure by Letters Patent, is: t

1. In an electric switching device, a revoluble shaft, 9. contactingbrush upon said shaft, a circular insulating member adjacent to saidbrush provided with contact pieces, said contact pieces electricallyconnected to one side of an electric circuit, said brush electricallyconnected to the other side of said electric circuit through said shaft,said brush provided with a chamber containing porous material, and saidporous material saturated with lubricating material.

2. In an electric switching device, a rotating shaft, a contacting brushadapted to be carried by said shaft, a bearing for said ber and porousmaterial in said chambier to re shaft, a circular insulating memberadjacent absorb said lubricating material.

to said brush, contact pieces attached to In testimony whereof I afiixmy signature said insulating member, said contafct plelzces 1n presenceof two witnesses. I electrically connected to one side 0 an e ecv triccircuit, said brush electrically connected JOSEPH LEHMA to the otherside of said electric circuit and Witnesses:

said brush provided with a lubricating MARGARET M. DUNLEAVY,

- chamber, lubricating material in said cham- THOMAS A. HILL.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents.

' Washington, D. G.

